| 4.1.1 User installation busbar recommendation | In(A) | 200, 400, 630, 800, 1000, 630, 800, 1000, 1250, 1600, 2000, 2500, 3200, 4000/3P, 4000/4P, 4000, 5000, 6300 |
| Busbar thickness mm | 5, 5, 5, 6, 5, 6, 6, 10, 12, 10, 8, 10, 10, 10, 10, 10, 10, 10 |
| Busbar width mm | 30, 30, 40, 50, 50, 60, 60, 60, 60, 100, 100, 100, 100, 120, 120, 120, 100, 100 |
| Number of busbar roots | 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 4, 4, 4, 7, 8 |
| Note a | The specifications in the table are when the circuit breaker is in an ambient environment of 40°C and installed in the open, meeting the copper bar specifications used under the heating conditions agreed in GB/T 14048.2. |
| Note b | When the copper bar selected by the user cannot match the circuit breaker terminals, an extension busbar needs to be designed and processed for transfer. The extension busbar is designed by the user. The cross-sectional area of the extension busbar must not be less than the requirements in the above table, and the gap between the extension busbars must not be smaller than the gap between the circuit breaker terminals. |
| Note c | After installing the busbars recommended in the above table, it must be ensured that the electrical gap between the same poles of the circuit breaker is not less than 18mm. |
| Note d | When load equipment can use thyristors for three-phase rectification and high-frequency inverter electrical components, such as high-frequency induction heating furnaces (medium frequency furnace steelmaking equipment), solid-state high-frequency welding machines (such as submerged arc welding machines and electrical machine), vacuum heating smelting equipment (such as monocrystalline silicon growth furnace), when selecting a circuit breaker, in addition to the effects of ambient temperature and altitude, you also need to consider the impact of high-order harmonics generated by the thyristor on the circuit breaker. At this time, the capacity must be reduced, and the derating factor (0.5~0.8) is recommended. |
| Note e | After the circuit breaker is installed, the safe distance between charged bodies of different potentials and between live bodies and the ground shall not be less than 18mm. |
| 4.1.2 Power loss of circuit breaker incoming and outgoing lines | Frame | Rated current (A) Drawer power loss (W) Fixed power loss (W) |
| 1000 | 1000 ≤ 245 ≤ 175 |
| 2000 | 2000 ≤ 475 ≤ 360 |
| 3200 | 3200 ≤ 760 ≤ 530 |
| 4000/3 | 4000 ≤ 1050 - |
| 4000/4 | 4000 ≤ 1150 ≤ 660 |
| 6300 | 6300 ≤ 1450 - |
| 4.1.3 Use with reduced capacity (under IP20 protection grade cabinet conditions, wire according to recommended copper bars) | | |
| 4.1.4 Derating at different temperatures | Execution standards | Ambient temperature (℃) NA1-1000X NA1-2000X NA1-3200X, 4000X NA1-6300X |
| GB/T 14048.2 IEC/EN 60947-2 | 40 200 400 630 800 1000 630 800 1000 1250 1600 2000 2500 3200 4000 5000 6300 |
| | 45 200 395 623 985 985 630 800 1000 1212 1600 2000 2450 3100 3800 5000 6000 |
| | 50 200 384 605 960 960 630 800 1000 1175 1600 1908 2000 2400 3000 3600 5000 |
| | 55 200 328 584 924 924 630 800 1000 1137 1600 1816 2000 2350 2900 3400 5000 |
| | 60 200 248 548 870 870 630 800 1000 1100 1552 1726 2000 2300 2800 3200 5200 |
| | 65 192 192 500 810 810 630 800 1000 1062 1534 1534 2000 2250 2600 3000 5000 |
| | 70 170 170 473 750 750 630 800 1000 1025 1504 1534 2000 2200 2400 2520 4000 4600 4700 |
| 4.1.5 Derating requirements at different altitudes | Altitude (m) | 2000 2500 3000 3500 4000 4500 5000 |
| Power frequency withstand voltage (V) | 3500 3500 3500 3500 3000 2500 2200 |
| Insulation voltage Ui(V) | 1000 1000 1000 1000 1000 1000 800 |
| Rated operating voltage Ue(V) | 690 690 690 690 690 690 560 |
| Rated operating current (Ie) | 0.97le 0.94le 0.94le 0.94le 0.88le 0.85le 0.82le |
